Improvement of charge resolution for high Z/b particles in CR-39 nuclear track detectors by means of two-step etching technique

We verified that the two-step etching method of the combination of pre-etching with PEW (Potassium hydroxide + Ethanol + Water) solution and post-etching with NaOH solution makes drastic improvement of charge resolution for high Z/b particles (Z: nuclear charge, b: velocity) in CR-39 nuclear track detectors. Detectors were exposed to several heavy ions from Ne to Kr with the energies of <500 MeV/n at HIMAC
(Heavy Ion Medical Accelerator in Chiba). The optimum etching conditions were determined to be a preetching of PEW solution with concentration of 60 wt% of ethanol for 40 min and a post-etching of 7N NaOH for 12 h. This resulted in a charge resolution for Kr (Z/b~60) of 0.18 c.u. (charge units). The Z/b detection threshold was increased as a function of ethanol concentration in PEW pre-etching solutions. We found that the two-step etching method would be useful technique for the precise charge identification by a single track measurement. The 60 wt% ethanol concentration in PEW would be adequate selection for the purpose of trans-iron nuclei measurement discriminating abundant light nuclei in galactic cosmic rays.

書誌情報

Nuclear Instruments & Methods in Physics Research Section B

巻 274, p. 36-41, 発行日 2012-03

ISSN

収録物識別子タイプ

ISSN

収録物識別子

0168-583X

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